possibility due to circumstances
E.g. You may order a taxi by telephone.
A useful rough-and-ready rule is that rime adverbs may come at either end of the sentence, but not in the middle.
May in this meaning occurs only in affirmative sentences and is followed only by the simple infinitive.
The form might is used in past-time contexts in accordance with the rules of the sequence of the tenses.
E.g. He said the might order a taxi by telephone.
Might followed by the Perfect Infinitive indicates that the action was not carried out owning to certain circumstances (expressed in the sentence or implied).
E.g. He might have fallen ill if he hadn’t taken the medicine.
Luckily he wasn’t driving the car. He might have been hurt.
You are so careless. You might have broken the cup. (Ты чуть было не разбил чашку).
It seemed to him that the most interesting thing in life was what might lie just around the corner. (O. Henry)
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